high
7.8
CWE
770 400
Advisory Published
CVE Published
Updated

CVE-2019-9517: Some HTTP/2 implementations are vulnerable to unconstrained interal data buffering, potentially leading to a denial of service

First published: Tue Aug 13 2019(Updated: )

A vulnerability was found in http/2 where an attacker opens the HTTP/2 window so the peer can send without constraint; however, they leave the TCP window closed so the peer cannot actually write (many of) the bytes on the wire. The attacker then sends a stream of requests for a large response object. Depending on how the servers queue the responses, this can consume excess memory, CPU, or both, potentially leading to a denial of service.

Credit: cret@cert.org cret@cert.org

Affected SoftwareAffected VersionHow to fix
redhat/jbcs-httpd24-httpd<0:2.4.29-41.jbcs.el6
0:2.4.29-41.jbcs.el6
redhat/jbcs-httpd24-nghttp2<0:1.39.2-1.jbcs.el6
0:1.39.2-1.jbcs.el6
redhat/jbcs-httpd24-apr<0:1.6.3-63.jbcs.el6
0:1.6.3-63.jbcs.el6
redhat/jbcs-httpd24-apr-util<0:1.6.1-48.jbcs.el6
0:1.6.1-48.jbcs.el6
redhat/jbcs-httpd24-brotli<0:1.0.6-7.jbcs.el6
0:1.0.6-7.jbcs.el6
redhat/jbcs-httpd24-curl<0:7.64.1-14.jbcs.el6
0:7.64.1-14.jbcs.el6
redhat/jbcs-httpd24-httpd<0:2.4.37-33.jbcs.el6
0:2.4.37-33.jbcs.el6
redhat/jbcs-httpd24-jansson<0:2.11-20.jbcs.el6
0:2.11-20.jbcs.el6
redhat/jbcs-httpd24-nghttp2<0:1.39.2-4.jbcs.el6
0:1.39.2-4.jbcs.el6
redhat/jbcs-httpd24-openssl<1:1.1.1-25.jbcs.el6
1:1.1.1-25.jbcs.el6
redhat/jbcs-httpd24-httpd<0:2.4.29-41.jbcs.el7
0:2.4.29-41.jbcs.el7
redhat/jbcs-httpd24-nghttp2<0:1.39.2-1.jbcs.el7
0:1.39.2-1.jbcs.el7
redhat/jbcs-httpd24-apr<0:1.6.3-63.jbcs.el7
0:1.6.3-63.jbcs.el7
redhat/jbcs-httpd24-apr-util<0:1.6.1-48.jbcs.el7
0:1.6.1-48.jbcs.el7
redhat/jbcs-httpd24-brotli<0:1.0.6-7.jbcs.el7
0:1.0.6-7.jbcs.el7
redhat/jbcs-httpd24-curl<0:7.64.1-14.jbcs.el7
0:7.64.1-14.jbcs.el7
redhat/jbcs-httpd24-httpd<0:2.4.37-33.jbcs.el7
0:2.4.37-33.jbcs.el7
redhat/jbcs-httpd24-jansson<0:2.11-20.jbcs.el7
0:2.11-20.jbcs.el7
redhat/jbcs-httpd24-nghttp2<0:1.39.2-4.jbcs.el7
0:1.39.2-4.jbcs.el7
redhat/jbcs-httpd24-openssl<1:1.1.1-25.jbcs.el7
1:1.1.1-25.jbcs.el7
redhat/httpd24-httpd<0:2.4.34-8.el6.1
0:2.4.34-8.el6.1
redhat/httpd24-nghttp2<0:1.7.1-7.el6.1
0:1.7.1-7.el6.1
redhat/rh-nodejs10<0:3.2-3.el7
0:3.2-3.el7
redhat/rh-nodejs10-nodejs<0:10.16.3-3.el7
0:10.16.3-3.el7
redhat/httpd24-httpd<0:2.4.34-8.el7.1
0:2.4.34-8.el7.1
redhat/httpd24-nghttp2<0:1.7.1-7.el7.1
0:1.7.1-7.el7.1
redhat/rh-nodejs8<0:3.0-5.el7
0:3.0-5.el7
redhat/rh-nodejs8-nodejs<0:8.16.1-2.el7
0:8.16.1-2.el7
redhat/Nodejs<8.16.1
8.16.1
redhat/Nodejs<10.16.3
10.16.3
redhat/Nodejs<12.8.1
12.8.1
Apple Swiftnio>=1.0.0<=1.4.0
Apple Mac OS X>=10.12
Canonical Ubuntu Linux>=14.04
Apache HTTP server>=2.4.20<2.4.40
Apache Traffic Server>=6.0.0<=6.2.3
Apache Traffic Server>=7.0.0<=7.1.6
Apache Traffic Server>=8.0.0<=8.0.3
Canonical Ubuntu Linux=16.04
Canonical Ubuntu Linux=18.04
Canonical Ubuntu Linux=19.04
Debian Debian Linux=9.0
Debian Debian Linux=10.0
Synology DiskStation Manager=6.2
Synology Skynas
Synology Vs960hd Firmware
Synology Vs960hd
Fedoraproject Fedora=29
Fedoraproject Fedora=30
openSUSE Leap=15.0
openSUSE Leap=15.1
Redhat Jboss Core Services=1.0
Redhat Jboss Enterprise Application Platform=7.2.0
Redhat Jboss Enterprise Application Platform=7.3.0
Redhat Openshift Service Mesh=1.0
Redhat Quay=3.0.0
Redhat Software Collections=1.0
Redhat Enterprise Linux=8.0
Oracle Communications Element Manager=8.0.0
Oracle Communications Element Manager=8.1.0
Oracle Communications Element Manager=8.1.1
Oracle Communications Element Manager=8.2.0
Oracle GraalVM=19.2.0
Oracle Instantis Enterprisetrack>=17.1<=17.3
Oracle Retail Xstore Point of Service=7.1
McAfee Web Gateway>=7.7.2.0<7.7.2.24
McAfee Web Gateway>=7.8.2.0<7.8.2.13
McAfee Web Gateway>=8.1.0<8.2.0
NetApp Clustered Data ONTAP
Nodejs Node.js>=8.0.0<=8.8.1
Nodejs Node.js>=8.9.0<8.16.1
Nodejs Node.js>=10.0.0<=10.12.0
Nodejs Node.js>=10.13.0<10.16.3
Nodejs Node.js>=12.0.0<12.8.1
All of
Apple Swiftnio>=1.0.0<=1.4.0
Any of
Apple Mac OS X>=10.12
Canonical Ubuntu Linux>=14.04
All of
Synology Vs960hd Firmware
Synology Vs960hd
debian/apache2
2.4.62-1~deb11u1
2.4.62-1~deb11u2
2.4.62-1~deb12u1
2.4.62-1~deb12u2
2.4.62-3

Remedy

https://www.oracle.com/technetwork/security-advisory/cpuoct2019-5072832.html

Remedy

The httpd version shipped with Red Hat Enterprise Linux 8 provides HTTP/2 support through mod_http2 package. While mod_http2 package is not updated, users can disable HTTP/2 support as mitigation action by executing the following steps: 1. Stop httpd service: $ systemctl stop httpd 2. Remove http/2 protocol support from configuration files: $ sed -i 's/\(h2\)\|\(h2c\)//g' <httpd_config_file> 3. Validate configuration files to make sure all syntax is valid: $ apachectl configtest 4. Restart httpd service: $ systemctl start httpd

Remedy

Disable http2 support

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Reference Links

Parent vulnerabilities

(Appears in the following advisories)

Frequently Asked Questions

  • What is the vulnerability ID?

    The vulnerability ID is CVE-2019-9517.

  • What is the severity of CVE-2019-9517?

    The severity of CVE-2019-9517 is high.

  • What is affected by CVE-2019-9517?

    HTTP/2 implementations such as Nodejs (versions 8.16.1, 10.16.3, 12.8.1) and jbcs-httpd24-* (various versions) are affected by CVE-2019-9517.

  • How can I fix CVE-2019-9517?

    To fix CVE-2019-9517, you should update your affected software to the recommended versions provided by the vendor.

  • Where can I find more information about CVE-2019-9517?

    You can find more information about CVE-2019-9517 on the Red Hat Bugzilla website.

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